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A096432 Let n = 2^e_2 * 3^e_3 * 5^e_5 * ... be the prime factorization of n; sequence gives n such that 1 + max{e_2, e_3, ...} is a prime. 3
2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 28, 29, 30, 31, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 55, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The old entry with this sequence number was a duplicate of A004555.

Sequence is of positive density. - Charles R Greathouse IV, Dec 07 2012

LINKS

Table of n, a(n) for n=1..74.

MAPLE

(Maple code for this entry and A074661)

M:=2000; ans1:=[]; ans2:=[];

for n from 1 to M do

t1:=op(2..-1, ifactors(n)); t2:=nops(t1);

m1:=0; for i from 1 to t2 do m1:=max(m1, t1[i][2]); od:

if isprime(1+m1) then ans1:=[op(ans1), n]; fi;

if isprime(m1) then ans2:=[op(ans2), n]; fi;

od:

PROG

(PARI) isA096432(n) = if(n<2, 0, isprime(vecmax(factor(n)[, 2])+1))

CROSSREFS

Cf. A060476, A074661.

Sequence in context: A007412 A270420 A220218 * A138302 A270428 A183220

Adjacent sequences:  A096429 A096430 A096431 * A096433 A096434 A096435

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 18 2008

STATUS

approved

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Last modified February 20 15:54 EST 2018. Contains 299380 sequences. (Running on oeis4.)